Panasonic Electric Works Nordic AB
MEW01351
Rev: -
Planning Instructions Fire alarm system EBL512 G3, V1.1.x
95
Figure 20. An
example
of the smouldering smoke algorithm for
an Analog smoke detector 4301.
Explanations to the figure:
In this example, the week average sensor value and the decision value
are "10" at the "starting point", i.e. due to contamination the
smouldering level has been adjusted to "24" (10+14), the pre-warning
level to "32" (10+22) and the fire alarm level to "40" (10+30).
When a smouldering fire starts, the sensor values and the decision
values will increase slowly upwards from "10".
1.
The decision value has here reached the smouldering level. A 7
minutes timer is started.
2.
After the 7 minutes the decision value is still over the smouldering
level and the pre-warning level and the fire alarm level are
lowered. A 90 minutes timer is started.
3.
The decision value has here reached the pre-warning level and
pre-warning is activated.
4.
After the 90 minutes the decision value is still over the pre-
warning level but has not reached the fire alarm level. The pre-
warning level and the fire alarm level are lowered again.
A 120 minutes timer is started.
5.
The decision value has here reached the fire alarm level and fire
alarm is activated.
6.
The decision value has here reached the original fire alarm level,
i.e. the fire alarm would have been activated approx. 90 minutes
later than with the smouldering algorithm!
16.5
Performance factor
To find out how the environment is where an analog smoke detector
430x is mounted, the
performance factor
can be studied. The
performance factor is shown in menu H4/U4 together with the min.
